<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录表单区 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="iconfont icon-3702mima"
            v-model="loginForm.password"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮区 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: "admin",
        password: "123456"
      },
      //表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          { min: 2, max: 6, message: "长度在2-6个字符", trigger: "blur" }
        ],
        password: [
          { required: true, message: "请输入密码", trigger: "blur" },
          { min: 6, max: 10, message: "长度在6-10个字符", trigger: "blur" }
        ]
      }
    }
  },
  methods: {
    //   点击重置按钮,重置登录表单
    resetLoginForm() {
      //   console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    //点击登录,登录前对表单数据进行预校验
    login() {
      // console.log(this);
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid) //true or false
        if (!valid) return // 若预检验不通过,直接return结束
        // const result = this.$http.post('login', this.loginForm) 返回的是一个promise对象,所以要async和await,要解构赋值
        // 解构data起别名
        const { data: res } = await this.$axios.post("login", this.loginForm)
        // console.log(res)
        if (res.meta.status !== 200) return this.$message.error("登录失败")
        this.$message.success("登录成功")
        console.log(res)
        /* 
          1 将登陆成功后的token,保存到客户端的sessionStorage
            .1 项目中出了登录之外的其他API接口,必须在登陆之后才能访问
            .2 token只应在当前网站打开期间起效,所以将token保存在sessionStorage,而不是localStorage
          2 通过编程式导航跳转到后台主页,路由地址是/home
        */
        window.sessionStorage.setItem("token", res.data.token)
        // 2 通过编程式导航跳转到后台主页,路由地址是/home
        this.$router.push("/home")
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 5px;
  position: absolute;
  left: 50%;
  right: 50%;
  transform: translate(-50%, 50%);
  .avatar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
    .btns {
      display: flex; //弹性伸缩布局
      justify-content: flex-end;
    }
  }
}
</style>
